Dredge



M. EVANS.

DREDGE.

APPLICATION FILED JUNE 15, 1920.

m m 1 m m WNMM m P w WITNESSS M. EVANS.

DREDGE.

APPLICATION FILED JUNE 1-5, 1920.

Patented Nov. 22, 1921.

3 SHEETS-SHEET 2.

Marvin Evans .NVENTOR ATTORNEY WITNESIS "M; EVANS.

DREDGE.

APPLICATION FILED JUNE 15, 1920.

Patented Nov.

3 SHEETS- Marvin Evans.

INVEuToR UNITED STATES PATENT OFFICE.

MARVIN EVANS, OFPHARR, TEXAS.

DREDGE.

Application. filed June 15,

To all whom it may concern:

Be it known that I, MARvIN Evans, citizen of the United States of America, residing at Pharr, in the county of Hidalgo and State of Texas, have invented new and useful Improvements in Dredges, of which the following is a specification.

This invention relatesto excavating machines particularly designed for canal digging and is an improvement upon a patent granted to Charles S. Butterfield, March 13, 1917 and numbered 1,219,371.

An object of the present invention is to provide means for supporting the excavating machine upon a frame suspended from either side of the excavation, to permit of the position of the machine being readily changed as the work progresses.

Another object is the provision of means for supporting the machine in a firm and stable manner, so that the maximum of power may be applied to the excavating buckets, while the supporting means will be maintained in proper position or elongated for the convenient travel of the machine.

Another object is the provision of a carriage which is movable over supporting tracks and over which the machine proper may be moved, so as to provide for a movement of the machine independent of the carriage.

Gther objects and advantages of the invention will appear as the following description is read in connection with the accompanying drawings, the invention consisting of the details of construction, combination and arrangement of parts which will be hereinafter fully described.

In the drawings Figure 1 is an elevation of a dredging machine embodying the present invention.

Fig. 2 is an elevation at right angles to Fig. 1.

Fig. 3 is a plan view of the carriage.

Fig. 1 is a similar view of the rail supporting stringers with the rails mounted thereon,

Fig. 5 is a section on the line 55 of Fi 4.

Feferring to the drawings in detail, wherein like characters of reference denote corresponding parts, the machine proper which is illustrated and described in the afore-mentioned Butterfield patent is herein shown as comprising a platform 10 of suitable construction, having extending upwardly therefrom a derrick which includes inclined side Specification of Letters Patent.

Patented Nov. 22, 1921 1920. Serial No. 389.174.

bars 11 and cross bars 12. The lower ends of the side bars are pivoted to the platform as shown at 13, while the derrick is supported at the outer inclination by means of cables 11 as illustrated in Fig. 2.

Iivotally mounted upon opposite sides of the platform 10 are booms 15, which carry sheaves or pulleys 16, at their outer ends. Traveling from these sheaves or pulleys are out hauled drag lines 17, having one end attached to the excavating buckets 18 and their opposite ends connected to suitably hoisting apparatus, such as showh in the afore-mentioned patent. The buckets 18 also have connected back drag or non-haul cables 19, which pass through pulleys or sheaves 2O suspended from the top of the derrick and have their ends also connected to suitable hoisting mechanism. The booms 15 are regulated through the medium of an elevating cable 21, one end of which is secured to the outer end of a boom, the said cable passing from a pulley or sheave 22 and having its fall line secured to a cleat 23 carried by the derrick.

The foregoing structure is substantially of the same as that shown and described in the Butterfield patent, the present invention consisting of the means for mounting this structure. For this purpose there is provided a carriage which is designated in its entirety by the reference character 21. It is made up of longitudinally extending I beams 25, which are connected by transverse channel beams 26 extending across the top of the I beams. Depending from the I beams 25 are spaced pairs of transversely extending I beams 27, while journaled in these last mentioned I beams upon axles '28 are flanged wheels 29. 'The wheels 29 have appreciably wide treads so as to ride over spaced pairs of rails 30 as illustrated in F ig. 1. In addition the I beams 25 have mounted thereon beams 32, which carry flanged wheels or rails 83 for engagement with I beams 81, depending from and secured to the beam platform 10.

In this arrangement the machine proper may be moved upon the carriage independently thereof to position the said machine in the proper position for use, while the carriage and machine may be moved over the tracks 30 when it is desired to move it any appreciable distance.

As shown in Fig. 1 the machine is designed to be supported across the top of an excavation and for this purpose the rails are laid along the edge of the excavation and in order to hold these rails in proper position and provide a proper length of trackage for the movement of the machine, the said rails are secured upon stringers 35. These stringers are arranged in sections 36, as shown in Fig. l, one rail of each section overlapping the end of the adjacent section to provide brake joints in the rails. Secured transversely of the bottom of the stringer sections 36 are cleats 37 which act to anchor the stringers and prevent the tracks from turning and buckling. This provides an exceedin ly simple and convenient means for accomplishing the purpose.

The invention is susceptible of various changes in its form, proportions and minor details of construction, and the right is herein reserved to make such changes as properly fall within the scope of the appended claims.

Having described the invention what is claimed is 1. An excavating machine embodying a platform, excavating mechanism supported thereby, tracks located upon each side of the excavatioma wheel supported carriage movable over the tracks, said carriage comprising a frame and including longitudinal beams and transverse beams Wheels journaled transversely of each end of the carriage for supporting the same, wheels journaled upon the top" of said carriage and tracks located beneath the bottom of the platform and operating over the last mentioned wheels to provide independent relative movement of the platform and carriage. 2. An excavating machine embodying a platform, excavating mechanism supported thereby, a track supported carriage located beneath the platform, spaced parallel beams supported upon the carriage and rollers journaled upon said beams for supporting the platform upon the carriage to permit of relative independent movement.

In testimony whereof I afiix my signature.

MARVIN EVANS. 

